async function async1() {
    console.log('async1 start'); //2
    await async2();
    // await console.log('哈哈');
    console.log('async1 end'); //6
}

async function async2() {
    await console.log('async2-----'); //3 
}

console.log('script start');  //1

setTimeout(function () {
    console.log('setTimeout'); //8
}, 0)

async1();

new Promise(function (resolve) {
    console.log('promise1'); //4
    resolve();
}).then(function () {
    console.log('promise2'); //7
});


console.log('script end'); //5